I want to restrict access to certain things in the JavaScript language from the outside. I've done some research on this, but I haven't been able to get anything I want. I know the underscore doesn't provide complete protection. When I try to reach from outside, I can easily reach. I'm going to write a sample code.
function Car(){
this._mileage = 0;
}
Car.prototype.drive = function(miles){
if(typeof miles == 'number' && miles > 0){
this._mileage += miles;
}else{
throw new Error("Sadece pozitif sayılar girin");
}
};
Car.prototype.readMileage = function(){
return this._mileage;
}
var hondo = new Car();
console.log('old: '+hondo._mileage);
hondo._mileage = 100;
console.log('new: '+hondo._mileage);As you can see: Although I used underscores, I could easily access from outside the classroom.
Another method
I found a method in my research. But I don't quite understand that either.
var Car = (function(){
var _ = PrivateParts.createKey(); // createKey = ?
function Car(mileage){
_(this).mileage = mileage;
}
Car.prototype.drive = function(miles){
if( typeof miles == 'number' && miles > 0){
_(this).mileage += miles;
}else{
throw new Error('drive only accepts positive numbers');
}
}
Car.prototype.readMileage = function(){
return _(this).mileage;
}
return Car;
}());